Predictions for Grazing Occultation of ZC 1768, 2007 Jul 20

Grazing Occultation of    1768 WF3      Magnitude   7.0s
Date   2007 July 20    (Friday)     Nominal site altitude  0m

E. Longit.   Latitude     U.T.    Sun  Moon   TanZ   PA    WA      CA
   o  '  "    o  '  "   h  m  s   Alt Alt Az          o     o      o
 145  0  0  -42 22 11   8 20 31       46 325  0.95  39.4  17.61  15.21N
 145 10  0  -42 27 34   8 20 52       46 325  0.96  39.3  17.56  15.16N
 145 20  0  -42 32 55   8 21 12       46 324  0.96  39.3  17.50  15.10N
 145 30  0  -42 38 14   8 21 33       46 324  0.97  39.2  17.44  15.04N
 145 40  0  -42 43 30   8 21 53       46 324  0.97  39.2  17.38  14.98N
 145 50  0  -42 48 44   8 22 13       46 324  0.98  39.1  17.32  14.92N
 146  0  0  -42 53 55   8 22 33       45 323  0.99  39.1  17.26  14.86N
 146 10  0  -42 59  5   8 22 53       45 323  0.99  39.0  17.20  14.80N
 146 20  0  -43  4 12   8 23 13       45 323  1.00  38.9  17.14  14.74N
 146 30  0  -43  9 17   8 23 33       45 323  1.01  38.9  17.08  14.68N
 146 40  0  -43 14 20   8 23 52       45 322  1.01  38.8  17.03  14.63N
 146 50  0  -43 19 21   8 24 12       45 322  1.02  38.8  16.97  14.57N
 147  0  0  -43 24 20   8 24 31       44 322  1.02  38.7  16.91  14.51N
 147 10  0  -43 29 16   8 24 50       44 322  1.03  38.6  16.85  14.45N
 147 20  0  -43 34 11   8 25  9       44 321  1.04  38.6  16.79  14.39N
 147 30  0  -43 39  3   8 25 28       44 321  1.04  38.5  16.74  14.34N
 147 40  0  -43 43 53   8 25 47       44 321  1.05  38.5  16.68  14.28N
 147 50  0  -43 48 41   8 26  5       43 321  1.06  38.4  16.62  14.22N
 148  0  0  -43 53 28   8 26 24       43 320  1.06  38.4  16.56  14.17N

Path coordinates are referred to WGS84 (as used by GPS).

   1768 is double :   7.0  6.5  19.8"   16.0
Graze Path of component #2  35.74km South, and 20.4 secs. earlier cf. primary.

   1768 = NSV 19355,   6.97 +/- 0.00 V ,  Type 

                Librations  Long +2.02   Lat +2.76
                            P +16.7     D -1.8
      Illumination of moon  32%+
        Elongation of Moon  69
    Vertical Profile Scale  2.04 km/arcsec at mean distance of moon
   Horizontal Scale Factor  1.42 deg/min

Limiting Magnitudes for various telescope apertures (in mm)
      CA\Tdia  50   100   150   200   250   300   350
    10.2      6.0   7.4   8.3   8.8   9.2   9.5   9.7
    12.2      6.0   7.5   8.3   8.8   9.2   9.5   9.7
    14.2      6.0   7.5   8.3   8.8   9.2   9.5   9.8
    16.2      6.0   7.5   8.3   8.8   9.2   9.5   9.8
    18.2      6.0   7.5   8.3   8.9   9.3   9.6   9.8

Lunar Limb Profile for graze